> of which the docking station will then demultiplex onto two full-size > lane for SuperSpeed+ TX, and two lanes for DisplayPort 1.4, the latter > the four high-speed lanes of USB-C as one lane for SuperSpeed+ RX, one > "DisplayPort alternate mode" of USB-C, so technically it will configure > over the USB data path), as well as support for two monitors via > connectivity (including an Ethernet controller and audio codec running > with power via USB Power Delivery and provides USB 3.1 Gen 2 (10 Gbit/s) > The docking station is connected via USB-C to the system, supplies it > processor together with the "Lenovo ThinkPad USB-C Dock (Gen 2)" > I run Ubuntu Budgie 20.04 on my Lenovo ThinkPad T14s with Ryzen 4750U Choose theĪdvances options and select an earlier kernel to boot with. Press shift and hold immediately on boot to display grub. Suggest boot with an earlier kernel to see if things begin to work again. That kernel was released on the 21st Sept. asset.tag: No Asset Informationĭmi.modalias: dmi:bvnLENOVO: bvrR1CET36W( 1.05):bd06/ 11/2020: svnLENOVO: pn20UH001AGE: pvrThinkPadT14s Gen1:rvnLENOVO: rn20UH001AGE: rvrNotDefined: cvnLENOVO: ct10:cvrNone:ĭmi.product.sku: LENOVO_ MT_20UH_ BU_Think_ FM_ThinkPad T14s Gen 1ĭmi.product. UserGroups: adm audio cdrom dip lpadmin lxd plugdev sambashare sudoĭmi.chassis.
#DOCKSTATION UBUNTU UPGRADE#
UpgradeStatus: No upgrade log present (probably fresh install) Linux- backports- modules- 5.4.0-48- generic N/A Linux- restricted- modules- 5.4.0-48- generic N/A InstallationMedia: Ubuntu-Budgie 20.04 LTS "Focal Fossa" - Release amd64 (20200423) InstallationDate: Installed on (75 days ago) I have attached parts of "dmesg" output which I deem relevant. Without this argument, the system only showed a single display in the settings, the same content was displayed on all connected monitors (mirrored) and there was no way to change that. (*) When I installed Ubuntu Budgie 20.04, I needed to add this in order to extend my desktop over the two external monitors.
exp_hw_ support= 1" in my kernel arguments (*) and the Ryzen 4000 GPU appears to be recognized.Ġ6:00.0 VGA compatible controller: Advanced Micro Devices, Inc. This is obviously very bad, since I now have to work on the internal display even with the laptop docked. Unplugging and replugging the cables from the docking station to the monitors does not change anything.Īudio, Ethernet and USB runs fine over the docking station, just DisplayPort does not.
The monitors say they do not receive a signal and I should check the connection. Even when they show up and are enabled, nothing is displayed on them. Sometimes the external monitors are detected (and shown as "enabled") in the display settings of Budgie, sometimes they do not even show up. Yesterday, I could get the monitors to show up by disconnecting the laptop from the docking station and reconnecting it again. However, both the LUKS/dm-crypt pre-boot- authentication screen (since I use full-disk- encryption) and also the desktop after login show up on the internal display, even with the laptop connected to the docking station, so it appears like the kernel no longer detects the monitors connecting via "DisplayPort alternate mode". The "BIOS" (EFI) boot screen (with the Lenovo logo) still shows up on the external monitors. However, for a couple of days now, I cannot get the system to detect the external monitors connected to my docking station anymore. So far, external monitors have worked fine most of the time. The docking station is connected via USB-C to the system, supplies it with power via USB Power Delivery and provides USB 3.1 Gen 2 (10 Gbit/s) connectivity (including an Ethernet controller and audio codec running over the USB data path), as well as support for two monitors via "DisplayPort alternate mode" of USB-C, so technically it will configure the four high-speed lanes of USB-C as one lane for SuperSpeed+ RX, one lane for SuperSpeed+ TX, and two lanes for DisplayPort 1.4, the latter of which the docking station will then demultiplex onto two full-size DisplayPort connectors like an MST hub.
I run Ubuntu Budgie 20.04 on my Lenovo ThinkPad T14s with Ryzen 4750U processor together with the "Lenovo ThinkPad USB-C Dock (Gen 2)" (40AS0090EU).
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